Black, Jeremy and Green, Anthony,
Gods,
Demons and Symbols of Ancient Mesopotamia: An Illustrated Dictionary,
University of Texas Press, Austin, 1992. However, not that it is not clear whether
information in an entry is applicable to the Sumerian, Akkadian, or both
versions of a particular deity or hero.

Jacobsen, Thorkild, The Treasures of Darkness, Yale University Press, New Haven,
1976. Jacobsen explores Mesopotamian religious
development from early Sumerian times through the Babylonian Enuma Elish. Most
of the book centres on the Sumerians.

Kramer, Samuel Noah, Sumerian Mythology,
Harper & Brothers, New York, 1961. This
slim volume contains much of the mythological material that wound up in The
Sumerians but concentrated in one spot and without much cultural or historical
detail. Many of the myths are more developed here, some of which are only
glossed over in The Sumerians, however in some cases The Sumerians holds the
more complete or updated myth.

Kramer, Samuel Noah, The Sumerians -- Their History, Culture and Character,
The University of Chicago Press, Chicago,1963 and 1971

Kramer, Samuel
Noah, History Begins at
Sumer, 1981 & 3rd edition 1989

Kramer, Samuel Noah, and Maier,
John, Myths of Enki, the Crafty God, Oxford
University Press, New York,1989. Probably the most recent work by Kramer. They translate and analyze all of the available myths which
include Enki.